Facilitates distributed management

Facilitates collaborative solutions

Makes it possible to publish the data that was possibly only kept privately

Allows contexts to be captured by multiple stores applied to the same data

Facilitates deprecation of IDs gracefully

The system can be set to recommend a "canon" that creates a de facto agreed ID, and this can be changed to another ID, allowing graceful change to the new one, over time and place.
Chosen IDs can be set to be keys, but not returned as results, thus giving the change a strong imperative.

Gives meaning to dead IDs

IDs disappear, while the things they reference don't, or they become deprecated. If you have one of these IDs, it is possible to find another, or a later ID to use and communicate with others, with the same agreed meaning.

Can work with differentFrom

There is another system differentFrom.org,
that can work in tandem with sameAs services, to record the important information that
an ID that might have been thought to be the same was in fact different.